Most foreign horses then Luke. There's a theory we seem to have in the UK (and from the bookies point of view it makes sense) that our horses are superior (a bookie probably won't lay anything other than the British horses - same in French races, Italian races etc.) If you find a good horse from a smaller nation ie. Germany, Spain, Italy etc. or a smaller trainer then you'll be on to a winner.
Take Maurice Delcher-Sanchez, a Spanish trainer. He's run 3 horses in Group 1 races (not individual G1's just generally), Suances won the Prix Jean Prat (his first G1 start), Equiano won the Kings Stand (his first G1 start) and Bannaby (his first G1 start was a win in the Prix Du Cadran). He was also something to do with Royal Gait I believe (my brief understanding of a Spanish TV feature on him).